Bit-stock



Q. S.. BACKUS.

BIT STOCK.

Patented Nov. 29,1881.

I 'Wl/ll/l/ INVENTURI Unirse Sintes arnNfr. trice.,

QUIMBY S. BACKUS, OF HOLYOKE, MASSACHUSETTS.

BIT-STOCK.

SPECIFICATION forming part of Letters Patent .No.*250,047, dated November 29, 1881.

Applicatinn filed December 2, 1879.

To all whom it may concern:

Be it known that I, QUIMBY S. BACKUS, of Holyoke, in the county of Hampden and State of Massachusetts, have invented a new a nd useful Improvement in Ratchet-Braces; and I do hereby declare that the following specification, taken in connection with the accompanying drawings, forming a part of the same, is a full, clear, and -exact description thereof.

My brace, like others heretofore well known, iscapable of use asa right-hand or a left-hand ratchet-brace, or as an ordinary tixed or rigid brace, and my improvement consists in the particular means ein ployed for controllingr and adjusting the pawl, as hereinafter fully described and claimed.

Referring to the drawings, Figure l shows, in elevation and partial section, aportion of a brace embodying my improvement. Figs. 2 and Srepresenta portion ot'said brace in horizontal section on the line cc. Fig. 4t shows, in perspective, the device employed to work the spring-pawl t'or adjusting it in dilferent posi-l tions; and Fig. 5 represent-s said pawl in perspective.

As shown in Figs. l, 2, and 3, .A denotes aI portion ofthe stock ofthe brace; B, the head into which it is screwed and to which it is secured, and C the device for griping the bit or other tool, which device is mounted on a spindie, D, passing through a portion of said head B. f

Secured to the spindle l) is a ratchet, E, which occupies a slot, b, in the head B, and engaging this ratchet by the force of a spring, F, is aspring tooth or pawl G. Thepawl G is of the forni shown at Fig. 5.- Itsbody is cylindrical, and it is mounted so as to turn freely in a cylindrical recess or chamber in the head B. In the same chamber, and at the rear end ofthe pawl, is located the spring F, as shown at Fig. l. The front end of the pawl G is formed into a tooth, G', ot' rectangular crosssection at the base. It has two parallel sides, g g, a side, g', at right angles thereto, and a beveled face, g2, as shown in Fig. 5. It is obvious that when the spring-pawl is so turned in its socket or bearing in the head-stock of the brace that its two parallel sides g g are engaged with the ratchet-wheel E the brace will be a stift' one. When, however, the springpawl is turned ninety degrees of a circle to the right or to the left the beveled face g2 of the spriiig-tooth will be in relation to the teeth of the ratchet, either as shown at Fig.2 or at Fig. 3, and the brace will become either a righthand or a left-hand ratchet-brace.

The device by which the spring-pawl G is worked is shown at Fig. 4. It consists, in this insta-nce, of a sleeve or collar, H, arranged concentric with the pawl and secured thereto by means of the pin J, and the upper halt' of the head or stock of the brace in the vicinity ofthe pin is ont away snfciently to allow the collar so attached to the spring-pawl to be moved for a short distance bickward and forward, and also to be rotated through the-half of a circle. The arrangement ol'the collar, the spring-pa.wl, and the connecting-pin is shown at Figs. 1,2, and 3.

rlo lock the spring-pawl in its several positions the edge ofthe collar H is furnished with three notches, 7i, Fig. 4, and there is inserted in the head-stock a stud-pin, K, Fig. 1. The positions of the notches in the collar correspond with the three positions of the springpawl exhibited in Figs. 1,2, and 3, and when any one of such notches is engaged with the pin the pawl is held in the corresponding position and the brace is a stiff brace,a right-hand or a lel'thand brace, as the oase may be.

To manipulate the brace it is only necessary to slide the collar H backward until the notch is clear ofthe stop-pin K, then rotate the collar to the right or to the left, thereby correspondingly rotating the spring-pawl, and when the desired point is reached allow the spring F to project the spring-pawl into engagement with the ratchet-wheel and the corresponding notch in the collar to engage with the holdingpin.

What I claim as my invention, and desire to secure by Letters Patent as an improvement in bit-braces, is-

In a ratchet-brace, the co1nbination,with the ratchet-wheel and the sliding spring-pawl, of the rotating and sliding collar H, connected with said pawl and provided with the stopnotches 7L for engaging with the stop-pin K yand securing said pawl in either of its various working positions, substantially as described.

QUIMBY S. BAGKUS.

Witnesses:

JOHN H. S'roU'r, C. J. MUNN.

IOC 

